<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box{
      /* outline: 5px silver solid;       */
      /* box-shadow: 0px 0px 10px 10px silver; */
      /* box-sizing: border-box; */
      width:200px;
      height: 200px;
      /* padding: 5px; */
      /* border: 5px dashed; */
      background-color: #bfa;
      margin:200px;
      border-radius: 30px 50px;
      transform: rotateZ(45deg);
    }
    .box2{
      width:200px;
      height: 200px;
      background-color: red;
    }
  </style>
</head>
<body>
  <div class="box"></div>
  <!-- <div class="box2"></div> -->
</body>
</html>